00627naa#a2200181#i#450# EN\\bibl\2844 20241009204506.3 2308-8877 20140616b2014####ek#y0engy0150####ca RUS RU Mathematical modeling of influence of the cost of an hour of free time on demand in the retail trade Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2014 4 с. Journal article local Ptitsa N. Nefedov N. naukaru.ru